Brake for dental engines



(No Model.) v

H. T. BAGHUS. BRAKE POR DENTAL ENGINES.

No. 497,370. Patented May 16.1893.

ZOWa/"cNfEac/m w f Jo/IILWJA" UNITED STATES PATENT OFFICE..

HOWARD T. EAOHUS, OFIST.- PAUL, MINNESOTA.

BRAKE FOR DENTAL ENGINES.

SPECIFICATION forming pere of Letters Patent Ne. 497,370, dared Mey 1e,1893. Application filed August 26, 1892. Serial No. 444,217. `(Nomodel.)

To all whom t may concern,.-

Be it known that I, HOWARD T. EACHUS, of St. Paul, Ramsey county,Minnesota, have invented certain Improvements in Brakes for DentalEngines, of which the followingis a specification.

My invention relates to brake attachments for dental eng-ines its objectbeing to provide a device which is under the control of the. pa-

1o tient, whereby he can at will, change the speed of or entirely stopthe rotation of the instrument, independent of the operator.

To this end my invention consists in securing upon the standard, towhich is secured the pulley for driving the tleXible shaft, the frame ofwhich is hinged, a disk brake adapted to be turned to bear against theside of the pulley, and a spring controlled fulcrum lever connectedtherewith adapted to be operated by zo the patient, whereby the brakecan be thrown against the pulley with any desired pressure to reduce itsspeed orto entirely stop the same.

My invention further consists in the speciiic construction andcombination hereinafter 2 5 described and particularly pointed out inthe claims.'

In the accompanying drawings forming part of this specification, Figure1 is a side elevation of the top of a standard of a dental en- 3o gine,shown equipped with my attachment, the full lines indicating the normalposition of the brake attachment and the dotted lines the position ofthe brake applied, and Fig. 2 is an isometrical projection of theattachment.

In the drawings 2 represents the standard of the engine having the shaftsleeve 3 adjustably secured thereon in the ordinary manner, as shown.

Mounted upon the shaft 4 and journaled in 4o said sleeve, is the sheave5 adapted to be driven by means of the eXible cord 6 oonnected with thetreadle pulley (not shown).

Olamped upon the sleeve 3 is the standard 7 having the arm 8 extendingin the line of the shaft and overhanging the sheave. To

the outer end of this arm is pivoted an annular ring 9, upon the innerface of which is secured a rubber ring or washer 10. This ring ispivoted in such position that it may be 5o turned to bear against theouter side of the pulley, as indicated by the dotted lines.

Pivoted in the standard 7. is the bell crank lever 11, to the power endof which is attached the cord 12 or its equivalent, which hangs withinreach of the patient while in the chair. To the fulcrum end of the leveris pivoted the connecting rod 13 leading to the ring 9. There is alsoarranged in the standard a spring 14 bearing upon the bell crankleverand tending to hold it in the full line position with the 6o brakethrown 0E the sheave.

Operation: While the engine is being operated to drill or otherwise Workupon the tooth of a patient,in case the patient desires to stop or checkthe same on account of the pain or heat, he can instantly accomplishthis result by pulling downward upon the cord. The brake is thus thrownagainst the side of the sheave and checks the same. If sufficientpressure is applied the sheave is entirely 7o stopped and with it theoperation of the burr.

I claim- 1. The combination with the dental engine, of a brake adaptedto be applied to the sheave mounted upon the driving shaft, and the bell'l crank lever connected therewith and adapted to be operated by thepatient and control the rotation of the shaft, substantially asdescribed. e 2. The combination with the standard of a 8o dental engine,its driving shaft and the pulley mounted thereon, of the brake adaptedto be applied to the side of the pulley, the bell crank lever and therod between said brake and said lever, and means under the control ofthe patient for operating said lever to apply said brake, substantiallyas described.

3. In a dental engine, the combination with the driving shaft, itsdriving pulley and the support for said shaft, of the standard mount- 9oed upon said support, the pivoted brake carried thereby and adapted tobe brought into contact with the side of said pulley, the bell cranklever pivoted upon said standard, and connected to said brake, and meansunder the control of the patient for operating said lever, substantiallyas described.

4. In a dental engine the combination with its standard, the drivingshaft, the driving pulley mounted thereon, and the journal support forsaid shaft, of the standard mounted upon the support, the pivotedannular ring supported upon said standard and adapted to bear againstthe side of said pulley, the

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bell crank lever pivoted to said standard, the rod connecting the sameto said brake, the spring normally holding said brake olf from saidpulley, and means operated by the patient for operating the lever toapply said brake, substantially as describe-dy 5. In a dental engine,the combination with the driving shaft and its pulley, of a braketherefor, a spring tending to hold said brake normally away from saidpulley, the spring controlled lever connected to said brake, and meansunder the control of the patient for operating the same to apply saidbrake, substantially as described.

6. In a dental engine, the combination with its driving sh aft and thedriving pulley moun t- IIOWARD T. EACI-IUS.

In presence of- T. D. MERWIN, H. S. JOHNSON.

